Expanding the system
Hi,
We have an 8kW Samsung ASHP heating the 3 bed house (cca 80sqm) through 7 radiators and a towel rack. It's working fine although in colder weather it's working hard to keep 21C all around the house.
We're planning a full bathroom renovation which includes breaking up and pouring new concrete floor. I'd really like to put underfloor heating in there at the same time (now or never). It's a small bathroom, less than 5sqm.
But I have a little worry about overloading the heat pump.
Could you give me advice in the question? Unfortunately the installer went out of business, so I can't ask them.
There should be no significant change in the load on the heat pump unless you keep the bathroom hotter and thus increase the losses through walls and ceiling. However, there may be a need for some associated modifications to the heating system.
Posted by: @johnrThere should be no significant change in the load on the heat pump unless you keep the bathroom hotter and thus increase the losses through walls and ceiling. However, there may be a need for some associated modifications to the heating system.
I'm sure the bathroom will be warmer. Which would be one of the purpose of this. But since it's quite small, I think the additional heat loss would be small too.
What additional modification would you expect?
@kundk you haven’t said where your bathroom is. If it’s on the ground floor and the floor is concrete is it insulated underneath. The age of your house will determine that.
Be careful with suppliers since some will try and push you to an electric heated floor which will be MUCH more expensive to run, but probably cheaper and easier to install.
Despite saying they are suitable for ufh some materials can only be heated to less that 29C (like our vinyl tiles) so you have consider everything together. You will need a space for the ufh manifold and down mixer for the water flow if you do want a surface like this. Ceramic tiles are best and remove that limitation, but there are guidelines on maximum floor temperature since feet can be burned, especially childrens’.
We love our ufh because it’s so gentle and comfortable with no radiators taking up space and wish it had been feasible to have it all round but solid concrete floors in our case made it unviable.
2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC
OK, so it's a bungalow built in 1969. As far as I know the concrete is only "insulated" with thin asbestos tiles at the top. But it is sinking (not the walls, only the concrete slab), so I want to break it up and re-pour anyway.
While doing that, we'll put 70-100mm insulation below it. And then could come the UFH, screed and tiles.
We want ceramic tiles anyway, so it won't be an issue. Mixer might needed. The max water temperature is 50C if I recall correctly.
I had a house with UFH, no need to convince me. 🙂
And they can try to push me to electric, but that won't happen.
@kundk you probably already know the builder/plumber will have to get a specialist in to remove the tiles because of the asbestos.
It is worth having the space between your underfloor pipes to be 100mm, since it gives you more heating options. Many plumbers will tell you that you won’t need that with insulation under your newly poured slab. With that extra heat you might not need a heated towel rail to supplement the room.
2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC
- 26 Forums
- 2,208 Topics
- 48.7 K Posts
- 29 Online
- 5,868 Members
Join Us!
Podcast Picks
Latest Posts
-
RE: Mitsubishi Ecodan F8 error
I absolutely love this. This is the quintessential heat...
By Mars , 6 hours ago
-
RE: Testing new controls/monitoring for Midea Clone ASHP
@papahuhu at the end of the day if you are happy with h...
By benson , 11 hours ago
-
RE: Can you recommend a Mitsubishi service engineer in the Rochdale area?
@dgclimatecontrol We'll all need annual servicing. How...
By Suzy-shadow , 11 hours ago
-
RE: Renewables & Heat Pumps in the News
@transparent I’ve understood your point now. The point ...
By Judith , 12 hours ago
-
RE: Octopus tariffs - a quick comparison
Does indeed need checking, @tim441. Neither Homely ...
By Majordennisbloodnok , 12 hours ago
-
RE: How not to install a heat pump
Delighted to hear that the buffer has been replumbed as...
By JamesPa , 13 hours ago
-
-
RE: Daikin 9kW to 8kW Swap Offer from Octopus
Yes but 9kW is similarly the 16kW derated. So 8kW subs...
By JamesPa , 15 hours ago
-
Actually, there's a rather greater degree of cattle-her...
By Majordennisbloodnok , 15 hours ago
-
RE: The Hidden Secret to a Successful Heat Pump: Pipe Size Matters
@davidnolan22 So far as I can tell from the 'other p...
By JamesPa , 19 hours ago
-
RE: 5 Star Service from Havenwise
I keep getting havenwise ads on my Facebook feed, so cl...
By benson , 21 hours ago
-
Automation options to maximuse efficiency & ToU tariffs
I started a conversation with ChatGPT. What automation...
By Tim441 , 1 day ago
-
RE: 4 Year Ongoing Heat Pump Battle With Poor Heat Pump Installation
@jamespa Oh, I know some that are good and some not so....
By ASHP-BOBBA , 1 day ago
-
RE: Samsung Heat pump with Yonos Pico circulating pump running all the time
I don't know how many pumps you have but I guess it's o...
By JamesPa , 1 day ago
-
RE: Help me keep the faith with my air source heat pump installation
That's just human nature unfortunately, not special to ...
By JamesPa , 1 day ago
-
@bontwoody how long has it been now since you started t...
By Mars , 2 days ago
-
RE: Bosch CS5800i 5kW - Experience So Far
Yes, over the last few days I've been keeping a very cl...
By Steelbadger , 2 days ago
-
Absolutely. I am one of those members and I most certai...
By Majordennisbloodnok , 2 days ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
@darrell-p There's another new Forum Member, @wully who...
By Transparent , 2 days ago