An other pump thread

[JohnnyJazz]

I've been asked by our contractor to confirm which pump we need for our house. To be honest it's a domain I don't have much interest in but clearly if I make the wrong decision I may regreat it for the coming few years each time I take a shower ...

The options : Mitsubishi 300 or 400 (KW I guess ???) or Grundfos. To be safe I would go either for the biggest Mitsu or, even better, the Grundfos. The problem is the big difference of price, 7,000 THB for the Mitsu 300, 14,000 THB (double !!!!) for the Mitsu 400 and 16,000 for the Grundfos.

The pomp will be attached to a 1,000 ltr tank in the ground floor and has to serve up to the 3rd flor where we have a bathroom and the washing machine, around 10 - 15 m higher.

What is the right choice ?

PS : Contractor recommends constant pressure pomp.

Edited January 15, 2015 by JohnnyJazz

[lopburi3]

The new small attached tank Grundfos pumps are very good and also quiet. Believe your best choice.

[steve187]

Grundfos hve been in the game many years, and make some of the best pumps in the UK

[IMHO]

For domestic use, we swear by the Hitachi inverter pumps. Not one has ever given us a problem (have been using them for more than 4 years now), they are quiet(er), never have surging, never have problems with hot/cold taps varying in pressure when taking a shower, and can supply very good flow rates with high pressure with multiple showers/taps running concurrently. You just don't notice when someone else turns a tap on with them.

They're not cheap, but we think, well worth it.

Note: the 400w models are more than enough for a typical house with 2-3 bathrooms, and 1-2 kitchens.

[kamalabob2]

In my observation Mitsubishhi, Hitachi and Grundfos are all quality water pumps if you buy the right type of water pump for your application. The knowledge and experience of what person or persons who install your water pump makes a real difference. The warranty of the installation makes a difference. A simple question to ask before you buy a water pump is how long is the warranty and EXACTLY what will happen in your case in your province if there is a problem with your new Hitachi Water Pump, Grundfos Water Pump or Mitsubishi Water Pump. Does the actual shop sent their own employees to your home to fix the water pump at your location at no charge during the warranty? Does the water pump shop have a full time repair facility in your province where the water pump can be fixed? Ask the shop where you are considering a purchase to confirm a price of any spare part that you might need AFTER the warranty period and how long they will take to get that part. Ask the shop if they will provide a free loaner water pump while your Grundfos, Mitsubishi or Hitachi water pump is being repaired. I bought a Mitsuibish water pump and a Hitachi inverter water pump in Buriram from Ruangsangthai located on highway 2074. There must be similar water pump installers in every province of Thailand that will have lower installation fees than HomePro home services charges in Buriram. You might be better served at your home by a water pump shop that on a daily basis installs and maintains commercial water pumps for resorts, apartment buildings, hospitals, government medical clinics, sports stadiums and the homes of Thai businessmen. There may be a shop where the owner speaks English and has actual years of experience of installations and repairs of water pumps for homes, farms, resorts and multi story buildings in your province.

[Langsuan Man]

The only advice that I can give from personal experience is that the Grundfos pumps are expensive but an excellent choice so long as you are not using a boiler for your hot water system. They work extremely well for on demand hot water systems because they instantly (and almost silently) get the water to the unit, with very little lag

On the other hand if using a boiler they get the "cold" water there too fast which can result in and uneven heating experience, especially annoying when taking a shower

[JohnnyJazz]

In my observation Mitsubishhi, Hitachi and Grundfos are all quality water pumps if you buy the right type of water pump for your application. The knowledge and experience of what person or persons who install your water pump makes a real difference. The warranty of the installation makes a difference. A simple question to ask before you buy a water pump is how long is the warranty and EXACTLY what will happen in your case in your province if there is a problem with your new Hitachi Water Pump, Grundfos Water Pump or Mitsubishi Water Pump. Does the actual shop sent their own employees to your home to fix the water pump at your location at no charge during the warranty? Does the water pump shop have a full time repair facility in your province where the water pump can be fixed? Ask the shop where you are considering a purchase to confirm a price of any spare part that you might need AFTER the warranty period and how long they will take to get that part. Ask the shop if they will provide a free loaner water pump while your Grundfos, Mitsubishi or Hitachi water pump is being repaired. I bought a Mitsuibish water pump and a Hitachi inverter water pump in Buriram from Ruangsangthai located on highway 2074. There must be similar water pump installers in every province of Thailand that will have lower installation fees than HomePro home services charges in Buriram. You might be better served at your home by a water pump shop that on a daily basis installs and maintains commercial water pumps for resorts, apartment buildings, hospitals, government medical clinics, sports stadiums and the homes of Thai businessmen. There may be a shop where the owner speaks English and has actual years of experience of installations and repairs of water pumps for homes, farms, resorts and multi story buildings in your province.

Thanks for the advises but we're living in Bangkok so it should be ok.

[JohnnyJazz]

The only advice that I can give from personal experience is that the Grundfos pumps are expensive but an excellent choice so long as you are not using a boiler for your hot water system. They work extremely well for on demand hot water systems because they instantly (and almost silently) get the water to the unit, with very little lag

On the other hand if using a boiler they get the "cold" water there too fast which can result in and uneven heating experience, especially annoying when taking a shower

Sorry for this stupid question, I'm obviously not a specialist in this field, but what do you call a boiler ? We're going to install electric water heaters in each bathroom. Is it what you call "boilers" ?

[Langsuan Man]

No that is what is called " an on demand system ". Water is heated at the point where it is needed. A boiler system is one where a central boiler heats the water and keeps it hot and then distributes it to where it is needed. The advantage is that you don't have to wait for the water to get hot. The disadvantage is that you must have a longer run of expensive heat resistant piping and it uses more electricity

[IMHO]

This is a boiler:

This is an on-demand heater:

And this is what you might want to consider, if building/remodelling:

Edited January 16, 2015 by IMHO

[JohnnyJazz]

^ Very clear answer, thank you !